One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,15)(8,12)(9,13)(10,14)(11,17)(16,20)(18,19)(21,22,25,29)(23,30,33,36)(24,28,26,35)(27,32,31,34)(1,2)(3,4)(5,7)(6,11)(8,16)(9,18)(10,17)(12,19)(13,20)(14,15)(21,22)(23,27)(24,35)(25,29)(26,28)(30,34)(31,33)(32,36) involution — undirected(2,4)(5,8,10,9)(6,12,14,13)(7,16,17,18)(11,19,15,20)(21,23,24,32,25,33,26,34)(22,27,35,36,29,31,28,30)(5,8,10,9)(6,13,14,12)(7,16,17,18)(11,20,15,19)(21,22)(23,31)(24,35)(25,29)(26,28)(27,33)(30,32)(34,36)(2,4)(5,9,10,8)(6,13,14,12)(7,16,17,18)(11,19,15,20)(21,24,25,26)(22,28,29,35)(23,32,33,34)(27,30,31,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.